Max mannesman



(N0 Model.) 2 She ets-Sheet M. MANNESMANN. A APPARATUS FOR ROLLINGSBAMLESS METALLIC TUBES.

No. 545,513. Patented Sept. 3", 1895 191111 ,S;$'/)S' Juufldar- I g raxlww 0% 755.9%, A

(No Model.) 2 Sheets-{Sheet 2.

M. MANNESMANN. A APPARATUS FOR ROLLING SEA MLESS METALLIC TUBES.

No. 545,513. Patented Sept. 3, 1895 UNITED STAT-Es;

PATENT OFFICE.

MAX MANNESMANN, 0F REMSOHEID, GERMANY.

APPARATUS FOR ROLLING SEAMLESS METALLIC TUBES.

SPECIFICATION forming part of Iletters Patent No. 545,513, datedSeptember 3,1895. Application filed January 28, 1895- Serial No.536,442- (No model.)

To all whom it may concern: a 4.

Be it known that I, MAX MANNESMANN, of Remscheid, Germany, have inventeda certain Improvement in Work-Gages ifor Apparatus Employed in RollingSeamless Metallic Tubes, of which the following is'a specification.

This improvement relates to the art of progressively reducing successivesections of a relatively thick shelled hollow ingot into integrallyunited lengths of relatively thin shelled tubing by the employment, incombination with a suitable mandrel, of intermit tently-acting rolls thecross-area of the pass through which gradually diminishesduringtheperformance of the reducing function and afterward suddenly increases,and thus affords opportunity for imparting such feed movements as may berequired for presenting the unacted upon part ofthe ingot in the properposition to receive the next attack of the rolls. This process ofreduction, which is known as step-by-step rolling, may be practiced bythe use of rolls which during the performance of the reducing functionare forcibly moved bodily toward each other or one toward the other, andthen separated from each other by a reverse movementto permit therequired feeding of the ingot. It is preferred, however, to employ tworolls, each of which has what may be called a paracentric working facemerging into a concentric finishing face, which together occupy aboutone hundred and eighty degrees of its perimeter, the remainder of itsperimeter being formed upon a diminished radius in order to afford roomandtime first impingement of the rolls upon the ingot shall be at shortdistances back of the forward extremity of its previously unacted uponin'g ingot being therefore convergent.

portion, so that bunches or waves of metal may be formed in front of theadvancing working faces of the rolls. During the rolling action theingot is forced bodily backward; but as the vertical dimension of theroll-pass diminishes thetwo waves of metal referred to are pressedtoward each other, their paths of motion relatively to the backwardlymov- It is desirable that the rolls shall be rotated with great rapidityin order that the entire series of the reducing operations may beperformed tion of the ingot, and there will then be danger of'stallingthe rolls orof breaking or dismounting them from their housings. On theother hand, if the ingot is not fed sufficiently far forward the'firstimpingement of the rolls may take place in front of the previouslyunacted upon portion of the ingot,in which case the ingot will be drivenrapidly backward without the formation of the waves of metal in front ofthe rolls, the presence of which is necessary to the successfulperformance by the rolls of the operation of working down the thickerend of the ingot step by step into finished integrally-connected lengthsof relatively thin shelled tubing.

It is the object of the present improvement toaccurately gage theforward-feeding movementof the ingot by presenting for impact, at firston the forward end and thereafter upon the partially-reduced portion ofthe ingot, a bifurcated stop the opposed faces of the jaws of which areslightly convex and approximately fit the forward end of the ingot,which by the preceding action of the rolls has been given a taperingshape. The jaws of the stop are chamfered upon their upper and lowersides in order that they-may extend into thev before the thicker portionof the ingot'has which the ingot is required to be fed being one inwhich the forward extremity of its unacted upon portion extends slightlyforward of the vertical plane of the axes of the two rolls. The twojawsof the bifurcated stop may be formed of separate pieces,but willpreferably be made integral with each other and with a hollow cylinderof sufficient internal diameter to allow of the free passage through itof the finished tube. Said cylinder with said bifurcated jaws,constituting what is herein designated the work-gage, is supported uponthe frame of the apparatus and is backed by a stiff spring, and thusgiven a narrow range of compressibility and resilience. By thisexpedient the ingot, after each action of the rolls upon it, may beturned and fed forward to the exactposition required for its appropriatepresentation for the next action of the rolls.

For the purposes of the present improvemen t, which relates to thecombination of the work-gage with the intermittently-actin g rolls, theingot may be assumed to have its feeding movement imparted to itmanually.

The accompanying drawings, representing the work-gage applied to a pairof paracentric rolls for progressively reducing a thickshelled hollowingot step by step into integrally-united lengths of thin-shelledtubing, are as follows:

Figure 1 is a transverse vertical section of a pair of paracentric rollsand of a hollow ingot in process of being reduced into a thin-- shelledtube, showing the work-gage in vertical section in the plane of thecentral longitudinal axis of the tube. Fig. 2 is a horizontal sectiontaken through the plane of the central longitudinal axis of the ingot,affording a top view of the lower roll and showing the partially-reducedforward end of the ingot in contact with the work-gage.

The apparatus represented in the drawings embraces two paracentric rollsA B, mounted in the usual manner between the housingstandards 0 O.

In Fig. 1 a hollow ingot or billet D is represented in solid lines inthe position to which it has been driven by the rotation of the rolls tothe position in which they are represented in solid lines. The ingot andthe rolls are represented in dotted lines in their relative positions atthe time of the commencement of an attack of the rolls upon the ingot.

In Fig. 2 the hollow ingot is represented as being fed forward to theposition which it is required to occupy in order to appropriatelypresent for the next action of the rolls the previously unacted uponpart of the ingot. In both drawings the mandrel E isrepresented aswithin the hollow ingot. In Fig. 1 the mandrel is represented as havingpartaken of the backward movement of the ingot. In Fig. 2 the mandrel isrepresented in the position which it occupies by reason of havingpartaken of the forward movement of the ingot.

As will be seen on reference to Fig. 2, the ingot is represented ashaving been brought to rest by the contact of its tapering forwardportion with the work gage, which consists of flaring jaws ff, which areformed integrally with the hollowblock or cylinder F. The cylinder F isprovided with the circumferential flange F, which is suitably perforatedto receive the bolts g g, by which the work-gage is secured to the yokeH. The yoke H is provided with perforations h h to admit the shanks ofthe bolts I I, which screw into the housing-standards O C, as shown.Between the head t' of each of the bolts I and the outer face of theyoke II is a strong volute-spring J, which. is placed under a conditionof high tension by the screwing home of the bolts I I, as shown. By thismode of sup porting the yoke IL'to which the work-gage is affixed, thework-gage is given a slight range of yielding movementv due to theyielding quality of the springs J J, and a corresponding range of returnmovement resulting from the resilient force of the springs J J.

As will be seen on reference to the drawings, the internal diameter ofthe work-gage and of the aperture 11 in the yoke H, which is inalignment with the work-gage, is amply large to permit of the passage ofthe finished tube d through the work-gage and yoke.

What is claimed as the invention isl. The combination as herein setforth of the paracentric rolls, A B, the housing standards, O G, themandrel, E, the work gage provided with the bifurcated jaws, f f theyoke, 11, fastening devices for fastening said work gage to said yoke,the bolts, I I, screwed into the housing standards, 0 0', each of thesaid bolts having a spring, J, interposed between .its headand the outerface of said yoke, as and for the purpose described.

2. A mandrel for supporting a hollow metallic ingot, a pair of step bystep acting rolls, substantially such as described, for progress ivelyreducing successive sections of said ingot into integrally unitedlengths of thin shelled tubing, in combination with a spring supportedwork gage bifurcated at one end and having its bifurcated end projectingpartially into the space between said two rolls, as and for the purposesset forth.

3. A mandrel for supporting a hollow metallic ingot and a pair of stepby step acting rolls substantially such as described for progressivelyreducing successive sections of said ingot into integrally unitedlengths of relatively thin shelled tubing, in combination with a workgage projecting partially into the space between said rolls, the saidwork gage affording clearance for the finished tubing but adapted topresent a bearing and act as a stop for the unreduced or incompletelyreduced forward end of the ingot for the purpose of arresting each ofthe endwise feeding movements ofthe ingot at a prescribed point.

4. A mandrel for supporting a hollow me Ito tallic ingot and a pair ofstep by step acting tially into the space between said two rolls, rollssubstantially such as described for proas and for the purpose specified.

gressively reducing successive sections of said ingot into integrallyunited lengths of rela- MAX MANNESMANN.

tively thin shelled tubing, in combination with Witnesses: a tubularwork gage bifurcated at one end ADOLF NOWAK,

and having its bifurcated end projecting par- R. LUDWIG.

